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<?php
/**
* Block Renderer REST API: WP_REST_Block_Renderer_Controller class
*
* @package WordPress
* @subpackage REST_API
* @since 5.0.0
*/
/**
* Controller which provides REST endpoint for rendering a block.
*
* @since 5.0.0
*
* @see WP_REST_Controller
*/
class WP_REST_Block_Renderer_Controller extends WP_REST_Controller {
/**
* Constructs the controller.
*
* @since 5.0.0
*/
public function __construct() {
$this->namespace = 'wp/v2';
$this->rest_base = 'block-renderer';
}
/**
* Registers the necessary REST API routes, one for each dynamic block.
*
* @since 5.0.0
*
* @see register_rest_route()
*/
public function register_routes() {
register_rest_route(
$this->namespace,
'/' . $this->rest_base . '/(?P<name>[a-z0-9-]+/[a-z0-9-]+)',
array(
'args' => array(
'name' => array(
'description' => __( 'Unique registered name for the block.' ),
'type' => 'string',
),
),
array(
'methods' => array( WP_REST_Server::READABLE, WP_REST_Server::CREATABLE ),
'callback' => array( $this, 'get_item' ),
'permission_callback' => array( $this, 'get_item_permissions_check' ),
'args' => array(
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
'attributes' => array(
'description' => __( 'Attributes for the block.' ),
'type' => 'object',
'default' => array(),
'validate_callback' => static function ( $value, $request ) {
$block = WP_Block_Type_Registry::get_instance()->get_registered( $request['name'] );
if ( ! $block ) {
// This will get rejected in ::get_item().
return true;
}
$schema = array(
'type' => 'object',
'properties' => $block->get_attributes(),
'additionalProperties' => false,
);
return rest_validate_value_from_schema( $value, $schema );
},
'sanitize_callback' => static function ( $value, $request ) {
$block = WP_Block_Type_Registry::get_instance()->get_registered( $request['name'] );
if ( ! $block ) {
// This will get rejected in ::get_item().
return true;
}
$schema = array(
'type' => 'object',
'properties' => $block->get_attributes(),
'additionalProperties' => false,
);
return rest_sanitize_value_from_schema( $value, $schema );
},
),
'post_id' => array(
'description' => __( 'ID of the post context.' ),
'type' => 'integer',
),
),
),
'schema' => array( $this, 'get_public_item_schema' ),
)
);
}
/**
* Checks if a given request has access to read blocks.
*
* @since 5.0.0
*
* @global WP_Post $post Global post object.
*
* @param WP_REST_Request $request Request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
*/
public function get_item_permissions_check( $request ) {
global $post;
$post_id = isset( $request['post_id'] ) ? (int) $request['post_id'] : 0;
if ( $post_id > 0 ) {
$post = get_post( $post_id );
if ( ! $post || ! current_user_can( 'edit_post', $post->ID ) ) {
return new WP_Error(
'block_cannot_read',
__( 'Sorry, you are not allowed to read blocks of this post.' ),
array(
'status' => rest_authorization_required_code(),
)
);
}
} else {
if ( ! current_user_can( 'edit_posts' ) ) {
return new WP_Error(
'block_cannot_read',
__( 'Sorry, you are not allowed to read blocks as this user.' ),
array(
'status' => rest_authorization_required_code(),
)
);
}
}
return true;
}
/**
* Returns block output from block's registered render_callback.
*
* @since 5.0.0
*
* @global WP_Post $post Global post object.
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function get_item( $request ) {
global $post;
$post_id = isset( $request['post_id'] ) ? (int) $request['post_id'] : 0;
if ( $post_id > 0 ) {
$post = get_post( $post_id );
// Set up postdata since this will be needed if post_id was set.
setup_postdata( $post );
}
$registry = WP_Block_Type_Registry::get_instance();
$registered = $registry->get_registered( $request['name'] );
if ( null === $registered || ! $registered->is_dynamic() ) {
return new WP_Error(
'block_invalid',
__( 'Invalid block.' ),
array(
'status' => 404,
)
);
}
$attributes = $request->get_param( 'attributes' );
// Create an array representation simulating the output of parse_blocks.
$block = array(
'blockName' => $request['name'],
'attrs' => $attributes,
'innerHTML' => '',
'innerContent' => array(),
);
// Render using render_block to ensure all relevant filters are used.
$data = array(
'rendered' => render_block( $block ),
);
return rest_ensure_response( $data );
}
/**
* Retrieves block's output schema, conforming to JSON Schema.
*
* @since 5.0.0
*
* @return array Item schema data.
*/
public function get_item_schema() {
if ( $this->schema ) {
return $this->schema;
}
$this->schema = array(
'$schema' => 'http://json-schema.org/schema#',
'title' => 'rendered-block',
'type' => 'object',
'properties' => array(
'rendered' => array(
'description' => __( 'The rendered block.' ),
'type' => 'string',
'required' => true,
'context' => array( 'edit' ),
),
),
);
return $this->schema;
}
}
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